CENOSIA. 343 
CGENOSIA. 
Cenosia, Meigen, Syst. Beschr. v. p. 210 (1826). 
In this genus the front is broad in both sexes, the arista is bare or pubescent ; the 
palpi are of the usual cylindrical or filiform shape; the abdomen is somewhat elongate 
and ending in a club (<4 ), or ovate and pointed at the tip (2); the under scale of the 
tegule extends beyond the upper; the small cross-vein is usually beyond the end of 
the first vein; and the anal vein is short. 
T have distinguished the following species from Mexico, all of which are described 
as new :— 
1. Palpiyellow ©. 2. 2... ww ee ee ek ee ee ee ee 
Palpi brown or black . 2... 1 ww we ee ee ee ee ee 
2. Antenne black . . . . See ee ee eee we we ww ee purnctulata. 
Antennz yellow or partly yellow . oe ee 
3. Legs yellow; middle and hind femora black at the tip wee ww we  Lenuicornis. 
Legs yellowish-rufous . . . . RE 8.002 71002 
4. Abdomen yellow and transparent at the base . soe ee we eee ee) =«macrocera. 
Abdomen cinereous or black . . . . rr P 
5. Legs yellow ; the front femora, except the tip, black wee ew ew ww we 6femoralis. 
Legs black, or with the black colour predominating . . . . . . . . . bistriata. 
1. Ceenosia punctulata, sp.n., ¢ 2. 
Cinereous ; abdomen with a dorsal line and two lateral points on each segment black; antenne black; palpi 
yellow ; legs rufous. 
Length 3°5 millim. 
Front black, as broad as the eyes ; frontal bristles long; face and cheeks greyish-white ; inferior part of the 
cheeks narrow. Antenne inserted above the median line of the eyes, black ; second joint with a whitish 
tip; third joint double as long as the second; arista bare. Proboscis black; palpi small, filiform, 
yellow. Thorax and scutellum cinereous, the thorax sometimes with indistinct brown stripes; meta- 
notum grey. Abdomen ovate, cinereous; second and third segments with an interrupted blackish dorsal 
line and on each side of it a blackish point, the dorsal line sometimes less conspicuous; some weak 
macrochsetz on the third and anal segments. Legs yellowish-rufous, with black tarsi; hind tibie with 
three long bristles posteriorly ; foot-claws and pulvilli somewhat elongate in the male, the pulvilli 
yellowish. Tegule whitish; halteres pale yellow. Wings greyish-hyaline; small cross-vein beyond the 
end of the first vein and nearly on the middle of the discal cell; third and fourth veins parallel ; 
terminal section of the fourth vein much longer than the penultimate section (2 or 3:1); posterior cross- 
vein straight, slightly oblique. 
Hab. Mexico, Patzcuaro (F. D. Godman), Xucumanatlan 7000 feet and Omilteme 
8000 feet, both in Guerrero (H. H. Smith). 
Two male and several female specimens. 
2. Ceenosia tenuicornis, sp. n., 2. 
Cinereous ; a dorsal line and large lateral spots on the abdomen brown; antenne and palpi yellow; legs 
rufous, the middle and hind blag at the tip. : 
Length 3 millim. as hee teh Se 
Front as broad as the eyes, cinereous, with two blackish stripes ; frontal bristles long; face and cheeks white ; 
